As part of a post-marketing commitment, GSK will conduct a survey of prescribers' and pharmacists' understanding of the risk of urinary retention with retigabine products. This is to address the effectiveness of the Risk Evaluation and Mitigation Strategy (REMS) as outlined in the REMS approved by the FDA on 10th June 2011. The objectives of this survey are to assess prescribers' and pharmacists' understanding of the risk of urinary retention and the symptoms of acute urinary retention potentially associated with retigabine use as evaluated by a survey instrument.